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Interaction of Organic Additives with Alumina Surfaces in a Ceramic Slurry

Published online by Cambridge University Press:  10 February 2011

W. M. Sigmund ,
G. Wegner  and
F. Aldinger
W. M. Sigmund
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, Heisenbergstr. 5, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
G. Wegner
Affiliation:
Max-Planck-Institute for Polymer Research, 55128 Mainz, Germany
F. Aldinger
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, Heisenbergstr. 5, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
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Abstract

The interaction of organic additives with alumina surfaces was studied using a typical tape casting composition for alumina: solvent mixture trichloroethylene/ethanol, polyvinylbutyral (PVB) as binder and fish oil as dispersant.

The characterization of the single components revealed why the dispersant Menhaden fish oil has such excellent dispersing properties for colloids and slurries. Menhaden fish oil used for wet-chemical processing was found to be a chemically polydisperse polymer with a dispersity of D=45 (by GPC) and a molecular weight of Mw=28,000.

The investigation of the interaction in the highly concentrated colloidal slurry indicates that the high molecular weight fraction of fish oil is preferentially adsorbed and that an onion like supramolecular structure is formed by the ceramic particle/dispersant/binder system. The sequence in this nanostructure can be controlled by the sequence of addition of the compounds and is guided by polymer effects. The results gained on powders are supported by experimental data from surface plasmon resonance spectroscopy (SPR).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 313
Copyright
Copyright © Materials Research Society 1996

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References

REFERENCES

1. Böhnlein-Maulß, J., Sigmund, W.M., Wegner, G., Meyer, W.H., Heßel, F., Seitz, K., Roosen, A. Advanced Materials, 4, 73, (1992).Google Scholar
2. Sigmund, W.M., PhD thesis, Max-Planck-Institut for Polymer Research and Johannes Gutenberg-Universität in Mainz, Germany, 1992.Google Scholar